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TMS370 Datasheet(PDF) 8 Page - Texas Instruments |
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TMS370 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 60 page  TMS370Cx2x 8-BIT MICROCONTROLLER SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997 8 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 central processing unit (CPU) (continued) The ST, status-bit notation, and status-bit definitions are shown in Table 3. Table 3. Status Registers 7 6 5 4 3 2 1 0 C N Z V IE2 IE1 Reserved Reserved RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 R = read, W = write, 0 = value after reset program counter (PC) The contents of the PC point to the memory location of the next instruction to be executed. The PC consists of two 8-bit registers in the CPU: the program counter high (PCH) and program counter low (PCL). These registers contain the most significant byte (MSbyte) and least significant byte (LSbyte) of a 16-bit address. During reset, the contents of the reset vector (7FFEh, 7FFFh) are loaded into the PC. The PCH (MSbyte of the PC) is loaded with the contents of memory location 7FFEh, and the PCL (LSbyte of the PC) is loaded with the contents of memory location 7FFFh. Figure 2 shows this operation using an example value of 6000h as the contents of the reset vector. Memory Program Counter (PC) 60 00 PCH PCL 60 00 0000h 7FFEh 7FFFh Figure 2. Program Counter After Reset memory map The TMS370Cx2x architecture is based on the Von Neuman architecture, where the program memory and data memory share a common address space. All peripheral input / output is memory mapped in this same common address space. As shown in Figure 3, the TMS370Cx2x provides memory-mapped RAM, ROM, EPROM, data EEPROM, I / O pins, peripheral functions, and system-interrupt vectors. The peripheral file contains all I / O port control, peripheral status and control, EEPROM, EPROM, and system-wide control functions. The peripheral file is located between 1010h to 105Fh and is divided logically into five peripheral file frames of 16 bytes each. Each on-chip peripheral is assigned to a separate frame through which peripheral control and data information is passed. |
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